drivers/net/bonding/bond_3ad.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   4  */
   5
   6 #include <linux/skbuff.h>
   7 #include <linux/if_ether.h>
   8 #include <linux/netdevice.h>
   9 #include <linux/spinlock.h>
  10 #include <linux/ethtool.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/if_bonding.h>
  13 #include <linux/pkt_sched.h>
  14 #include <net/net_namespace.h>
  15 #include <net/bonding.h>
  16 #include <net/bond_3ad.h>
  17 #include <net/netlink.h>
  18
  19 /* General definitions */
  20 #define AD_SHORT_TIMEOUT           1
  21 #define AD_LONG_TIMEOUT            0
  22 #define AD_STANDBY                 0x2
  23 #define AD_MAX_TX_IN_SECOND        3
  24 #define AD_COLLECTOR_MAX_DELAY     0
  25
  26 /* Timer definitions (43.4.4 in the 802.3ad standard) */
  27 #define AD_FAST_PERIODIC_TIME      1
  28 #define AD_SLOW_PERIODIC_TIME      30
  29 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  30 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  31 #define AD_CHURN_DETECTION_TIME    60
  32 #define AD_AGGREGATE_WAIT_TIME     2
  33
  34 /* Port Variables definitions used by the State Machines (43.4.7 in the
  35  * 802.3ad standard)
  36  */
  37 #define AD_PORT_BEGIN           0x1
  38 #define AD_PORT_LACP_ENABLED    0x2
  39 #define AD_PORT_ACTOR_CHURN     0x4
  40 #define AD_PORT_PARTNER_CHURN   0x8
  41 #define AD_PORT_READY           0x10
  42 #define AD_PORT_READY_N         0x20
  43 #define AD_PORT_MATCHED         0x40
  44 #define AD_PORT_STANDBY         0x80
  45 #define AD_PORT_SELECTED        0x100
  46 #define AD_PORT_MOVED           0x200
  47 #define AD_PORT_CHURNED         (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
  48
  49 /* Port Key definitions
  50  * key is determined according to the link speed, duplex and
  51  * user key (which is yet not supported)
  52  *           --------------------------------------------------------------
  53  * Port key  | User key (10 bits)           | Speed (5 bits)      | Duplex|
  54  *           --------------------------------------------------------------
  55  *           |15                           6|5                   1|0
  56  */
  57 #define  AD_DUPLEX_KEY_MASKS    0x1
  58 #define  AD_SPEED_KEY_MASKS     0x3E
  59 #define  AD_USER_KEY_MASKS      0xFFC0
  60
  61 enum ad_link_speed_type {
  62         AD_LINK_SPEED_1MBPS = 1,
  63         AD_LINK_SPEED_10MBPS,
  64         AD_LINK_SPEED_100MBPS,
  65         AD_LINK_SPEED_1000MBPS,
  66         AD_LINK_SPEED_2500MBPS,
  67         AD_LINK_SPEED_5000MBPS,
  68         AD_LINK_SPEED_10000MBPS,
  69         AD_LINK_SPEED_14000MBPS,
  70         AD_LINK_SPEED_20000MBPS,
  71         AD_LINK_SPEED_25000MBPS,
  72         AD_LINK_SPEED_40000MBPS,
  73         AD_LINK_SPEED_50000MBPS,
  74         AD_LINK_SPEED_56000MBPS,
  75         AD_LINK_SPEED_100000MBPS,
  76         AD_LINK_SPEED_200000MBPS,
  77         AD_LINK_SPEED_400000MBPS,
  78 };
  79
  80 /* compare MAC addresses */
  81 #define MAC_ADDRESS_EQUAL(A, B) \
  82         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
  83
  84 static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = {
  85         0, 0, 0, 0, 0, 0
  86 };
  87 static u16 ad_ticks_per_sec;
  88 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  89
  90 static const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned =
  91         MULTICAST_LACPDU_ADDR;
  92
  93 /* ================= main 802.3ad protocol functions ================== */
  94 static int ad_lacpdu_send(struct port *port);
  95 static int ad_marker_send(struct port *port, struct bond_marker *marker);
  96 static void ad_mux_machine(struct port *port, bool *update_slave_arr);
  97 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
  98 static void ad_tx_machine(struct port *port);
  99 static void ad_periodic_machine(struct port *port, struct bond_params *bond_params);
 100 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
 101 static void ad_agg_selection_logic(struct aggregator *aggregator,
 102                                    bool *update_slave_arr);
 103 static void ad_clear_agg(struct aggregator *aggregator);
 104 static void ad_initialize_agg(struct aggregator *aggregator);
 105 static void ad_initialize_port(struct port *port, int lacp_fast);
 106 static void ad_enable_collecting_distributing(struct port *port,
 107                                               bool *update_slave_arr);
 108 static void ad_disable_collecting_distributing(struct port *port,
 109                                                bool *update_slave_arr);
 110 static void ad_marker_info_received(struct bond_marker *marker_info,
 111                                     struct port *port);
 112 static void ad_marker_response_received(struct bond_marker *marker,
 113                                         struct port *port);
 114 static void ad_update_actor_keys(struct port *port, bool reset);
 115
 116
 117 /* ================= api to bonding and kernel code ================== */
 118
 119 /**
 120  * __get_bond_by_port - get the port's bonding struct
 121  * @port: the port we're looking at
 122  *
 123  * Return @port's bonding struct, or %NULL if it can't be found.
 124  */
 125 static inline struct bonding *__get_bond_by_port(struct port *port)
 126 {
 127         if (port->slave == NULL)
 128                 return NULL;
 129
 130         return bond_get_bond_by_slave(port->slave);
 131 }
 132
 133 /**
 134  * __get_first_agg - get the first aggregator in the bond
 135  * @port: the port we're looking at
 136  *
 137  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 138  * found.
 139  * The caller must hold RCU or RTNL lock.
 140  */
 141 static inline struct aggregator *__get_first_agg(struct port *port)
 142 {
 143         struct bonding *bond = __get_bond_by_port(port);
 144         struct slave *first_slave;
 145         struct aggregator *agg;
 146
 147         /* If there's no bond for this port, or bond has no slaves */
 148         if (bond == NULL)
 149                 return NULL;
 150
 151         rcu_read_lock();
 152         first_slave = bond_first_slave_rcu(bond);
 153         agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
 154         rcu_read_unlock();
 155
 156         return agg;
 157 }
 158
 159 /**
 160  * __agg_has_partner - see if we have a partner
 161  * @agg: the agregator we're looking at
 162  *
 163  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 164  * address for the partner). Return 0 if not.
 165  */
 166 static inline int __agg_has_partner(struct aggregator *agg)
 167 {
 168         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 169 }
 170
 171 /**
 172  * __disable_port - disable the port's slave
 173  * @port: the port we're looking at
 174  */
 175 static inline void __disable_port(struct port *port)
 176 {
 177         bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
 178 }
 179
 180 /**
 181  * __enable_port - enable the port's slave, if it's up
 182  * @port: the port we're looking at
 183  */
 184 static inline void __enable_port(struct port *port)
 185 {
 186         struct slave *slave = port->slave;
 187
 188         if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
 189                 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
 190 }
 191
 192 /**
 193  * __port_is_enabled - check if the port's slave is in active state
 194  * @port: the port we're looking at
 195  */
 196 static inline int __port_is_enabled(struct port *port)
 197 {
 198         return bond_is_active_slave(port->slave);
 199 }
 200
 201 /**
 202  * __get_agg_selection_mode - get the aggregator selection mode
 203  * @port: the port we're looking at
 204  *
 205  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 206  */
 207 static inline u32 __get_agg_selection_mode(struct port *port)
 208 {
 209         struct bonding *bond = __get_bond_by_port(port);
 210
 211         if (bond == NULL)
 212                 return BOND_AD_STABLE;
 213
 214         return bond->params.ad_select;
 215 }
 216
 217 /**
 218  * __check_agg_selection_timer - check if the selection timer has expired
 219  * @port: the port we're looking at
 220  */
 221 static inline int __check_agg_selection_timer(struct port *port)
 222 {
 223         struct bonding *bond = __get_bond_by_port(port);
 224
 225         if (bond == NULL)
 226                 return 0;
 227
 228         return atomic_read(&BOND_AD_INFO(bond).agg_select_timer) ? 1 : 0;
 229 }
 230
 231 /**
 232  * __get_link_speed - get a port's speed
 233  * @port: the port we're looking at
 234  *
 235  * Return @port's speed in 802.3ad enum format. i.e. one of:
 236  *     0,
 237  *     %AD_LINK_SPEED_10MBPS,
 238  *     %AD_LINK_SPEED_100MBPS,
 239  *     %AD_LINK_SPEED_1000MBPS,
 240  *     %AD_LINK_SPEED_2500MBPS,
 241  *     %AD_LINK_SPEED_5000MBPS,
 242  *     %AD_LINK_SPEED_10000MBPS
 243  *     %AD_LINK_SPEED_14000MBPS,
 244  *     %AD_LINK_SPEED_20000MBPS
 245  *     %AD_LINK_SPEED_25000MBPS
 246  *     %AD_LINK_SPEED_40000MBPS
 247  *     %AD_LINK_SPEED_50000MBPS
 248  *     %AD_LINK_SPEED_56000MBPS
 249  *     %AD_LINK_SPEED_100000MBPS
 250  *     %AD_LINK_SPEED_200000MBPS
 251  *     %AD_LINK_SPEED_400000MBPS
 252  */
 253 static u16 __get_link_speed(struct port *port)
 254 {
 255         struct slave *slave = port->slave;
 256         u16 speed;
 257
 258         /* this if covers only a special case: when the configuration starts
 259          * with link down, it sets the speed to 0.
 260          * This is done in spite of the fact that the e100 driver reports 0
 261          * to be compatible with MVT in the future.
 262          */
 263         if (slave->link != BOND_LINK_UP)
 264                 speed = 0;
 265         else {
 266                 switch (slave->speed) {
 267                 case SPEED_10:
 268                         speed = AD_LINK_SPEED_10MBPS;
 269                         break;
 270
 271                 case SPEED_100:
 272                         speed = AD_LINK_SPEED_100MBPS;
 273                         break;
 274
 275                 case SPEED_1000:
 276                         speed = AD_LINK_SPEED_1000MBPS;
 277                         break;
 278
 279                 case SPEED_2500:
 280                         speed = AD_LINK_SPEED_2500MBPS;
 281                         break;
 282
 283                 case SPEED_5000:
 284                         speed = AD_LINK_SPEED_5000MBPS;
 285                         break;
 286
 287                 case SPEED_10000:
 288                         speed = AD_LINK_SPEED_10000MBPS;
 289                         break;
 290
 291                 case SPEED_14000:
 292                         speed = AD_LINK_SPEED_14000MBPS;
 293                         break;
 294
 295                 case SPEED_20000:
 296                         speed = AD_LINK_SPEED_20000MBPS;
 297                         break;
 298
 299                 case SPEED_25000:
 300                         speed = AD_LINK_SPEED_25000MBPS;
 301                         break;
 302
 303                 case SPEED_40000:
 304                         speed = AD_LINK_SPEED_40000MBPS;
 305                         break;
 306
 307                 case SPEED_50000:
 308                         speed = AD_LINK_SPEED_50000MBPS;
 309                         break;
 310
 311                 case SPEED_56000:
 312                         speed = AD_LINK_SPEED_56000MBPS;
 313                         break;
 314
 315                 case SPEED_100000:
 316                         speed = AD_LINK_SPEED_100000MBPS;
 317                         break;
 318
 319                 case SPEED_200000:
 320                         speed = AD_LINK_SPEED_200000MBPS;
 321                         break;
 322
 323                 case SPEED_400000:
 324                         speed = AD_LINK_SPEED_400000MBPS;
 325                         break;
 326
 327                 default:
 328                         /* unknown speed value from ethtool. shouldn't happen */
 329                         if (slave->speed != SPEED_UNKNOWN)
 330                                 pr_err_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n",
 331                                             slave->bond->dev->name,
 332                                             slave->dev->name, slave->speed,
 333                                             port->actor_port_number);
 334                         speed = 0;
 335                         break;
 336                 }
 337         }
 338
 339         slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n",
 340                   port->actor_port_number, speed);
 341         return speed;
 342 }
 343
 344 /**
 345  * __get_duplex - get a port's duplex
 346  * @port: the port we're looking at
 347  *
 348  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 349  *     0x01 if in full duplex
 350  *     0x00 otherwise
 351  */
 352 static u8 __get_duplex(struct port *port)
 353 {
 354         struct slave *slave = port->slave;
 355         u8 retval = 0x0;
 356
 357         /* handling a special case: when the configuration starts with
 358          * link down, it sets the duplex to 0.
 359          */
 360         if (slave->link == BOND_LINK_UP) {
 361                 switch (slave->duplex) {
 362                 case DUPLEX_FULL:
 363                         retval = 0x1;
 364                         slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n",
 365                                   port->actor_port_number);
 366                         break;
 367                 case DUPLEX_HALF:
 368                 default:
 369                         retval = 0x0;
 370                         slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n",
 371                                   port->actor_port_number);
 372                         break;
 373                 }
 374         }
 375         return retval;
 376 }
 377
 378 static void __ad_actor_update_port(struct port *port)
 379 {
 380         const struct bonding *bond = bond_get_bond_by_slave(port->slave);
 381
 382         port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
 383         port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
 384 }
 385
 386 /* Conversions */
 387
 388 /**
 389  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 390  * @timer_type: which timer to operate
 391  * @par: timer parameter. see below
 392  *
 393  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 394  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 395  *                                                   %SLOW_PERIODIC_TIME.
 396  */
 397 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 398 {
 399         u16 retval = 0; /* to silence the compiler */
 400
 401         switch (timer_type) {
 402         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 403                 if (par)
 404                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 405                 else
 406                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 407                 break;
 408         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 409                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 410                 break;
 411         case AD_PERIODIC_TIMER:         /* for periodic machine */
 412                 retval = (par*ad_ticks_per_sec); /* long timeout */
 413                 break;
 414         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 415                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 416                 break;
 417         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 418                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 419                 break;
 420         }
 421
 422         return retval;
 423 }
 424
 425
 426 /* ================= ad_rx_machine helper functions ================== */
 427
 428 /**
 429  * __choose_matched - update a port's matched variable from a received lacpdu
 430  * @lacpdu: the lacpdu we've received
 431  * @port: the port we're looking at
 432  *
 433  * Update the value of the matched variable, using parameter values from a
 434  * newly received lacpdu. Parameter values for the partner carried in the
 435  * received PDU are compared with the corresponding operational parameter
 436  * values for the actor. Matched is set to TRUE if all of these parameters
 437  * match and the PDU parameter partner_state.aggregation has the same value as
 438  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 439  * in the aggregation. Matched is also set to TRUE if the value of
 440  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 441  * an individual link and lacp will actively maintain the link. Otherwise,
 442  * matched is set to FALSE. LACP is considered to be actively maintaining the
 443  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 444  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 445  * partner_state.lacp_activity variables are TRUE.
 446  *
 447  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 448  * used here to implement the language from 802.3ad 43.4.9 that requires
 449  * recordPDU to "match" the LACPDU parameters to the stored values.
 450  */
 451 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 452 {
 453         /* check if all parameters are alike
 454          * or this is individual link(aggregation == FALSE)
 455          * then update the state machine Matched variable.
 456          */
 457         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 458              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 459              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 460              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 461              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 462              ((lacpdu->partner_state & LACP_STATE_AGGREGATION) == (port->actor_oper_port_state & LACP_STATE_AGGREGATION))) ||
 463             ((lacpdu->actor_state & LACP_STATE_AGGREGATION) == 0)
 464                 ) {
 465                 port->sm_vars |= AD_PORT_MATCHED;
 466         } else {
 467                 port->sm_vars &= ~AD_PORT_MATCHED;
 468         }
 469 }
 470
 471 /**
 472  * __record_pdu - record parameters from a received lacpdu
 473  * @lacpdu: the lacpdu we've received
 474  * @port: the port we're looking at
 475  *
 476  * Record the parameter values for the Actor carried in a received lacpdu as
 477  * the current partner operational parameter values and sets
 478  * actor_oper_port_state.defaulted to FALSE.
 479  */
 480 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 481 {
 482         if (lacpdu && port) {
 483                 struct port_params *partner = &port->partner_oper;
 484
 485                 __choose_matched(lacpdu, port);
 486                 /* record the new parameter values for the partner
 487                  * operational
 488                  */
 489                 partner->port_number = ntohs(lacpdu->actor_port);
 490                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 491                 partner->system = lacpdu->actor_system;
 492                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 493                 partner->key = ntohs(lacpdu->actor_key);
 494                 partner->port_state = lacpdu->actor_state;
 495
 496                 /* set actor_oper_port_state.defaulted to FALSE */
 497                 port->actor_oper_port_state &= ~LACP_STATE_DEFAULTED;
 498
 499                 /* set the partner sync. to on if the partner is sync,
 500                  * and the port is matched
 501                  */
 502                 if ((port->sm_vars & AD_PORT_MATCHED) &&
 503                     (lacpdu->actor_state & LACP_STATE_SYNCHRONIZATION)) {
 504                         partner->port_state |= LACP_STATE_SYNCHRONIZATION;
 505                         slave_dbg(port->slave->bond->dev, port->slave->dev,
 506                                   "partner sync=1\n");
 507                 } else {
 508                         partner->port_state &= ~LACP_STATE_SYNCHRONIZATION;
 509                         slave_dbg(port->slave->bond->dev, port->slave->dev,
 510                                   "partner sync=0\n");
 511                 }
 512         }
 513 }
 514
 515 /**
 516  * __record_default - record default parameters
 517  * @port: the port we're looking at
 518  *
 519  * This function records the default parameter values for the partner carried
 520  * in the Partner Admin parameters as the current partner operational parameter
 521  * values and sets actor_oper_port_state.defaulted to TRUE.
 522  */
 523 static void __record_default(struct port *port)
 524 {
 525         if (port) {
 526                 /* record the partner admin parameters */
 527                 memcpy(&port->partner_oper, &port->partner_admin,
 528                        sizeof(struct port_params));
 529
 530                 /* set actor_oper_port_state.defaulted to true */
 531                 port->actor_oper_port_state |= LACP_STATE_DEFAULTED;
 532         }
 533 }
 534
 535 /**
 536  * __update_selected - update a port's Selected variable from a received lacpdu
 537  * @lacpdu: the lacpdu we've received
 538  * @port: the port we're looking at
 539  *
 540  * Update the value of the selected variable, using parameter values from a
 541  * newly received lacpdu. The parameter values for the Actor carried in the
 542  * received PDU are compared with the corresponding operational parameter
 543  * values for the ports partner. If one or more of the comparisons shows that
 544  * the value(s) received in the PDU differ from the current operational values,
 545  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 546  * set to out_of_sync. Otherwise, selected remains unchanged.
 547  */
 548 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 549 {
 550         if (lacpdu && port) {
 551                 const struct port_params *partner = &port->partner_oper;
 552
 553                 /* check if any parameter is different then
 554                  * update the state machine selected variable.
 555                  */
 556                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 557                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 558                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 559                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 560                     ntohs(lacpdu->actor_key) != partner->key ||
 561                     (lacpdu->actor_state & LACP_STATE_AGGREGATION) != (partner->port_state & LACP_STATE_AGGREGATION)) {
 562                         port->sm_vars &= ~AD_PORT_SELECTED;
 563                 }
 564         }
 565 }
 566
 567 /**
 568  * __update_default_selected - update a port's Selected variable from Partner
 569  * @port: the port we're looking at
 570  *
 571  * This function updates the value of the selected variable, using the partner
 572  * administrative parameter values. The administrative values are compared with
 573  * the corresponding operational parameter values for the partner. If one or
 574  * more of the comparisons shows that the administrative value(s) differ from
 575  * the current operational values, then Selected is set to FALSE and
 576  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 577  * Selected remains unchanged.
 578  */
 579 static void __update_default_selected(struct port *port)
 580 {
 581         if (port) {
 582                 const struct port_params *admin = &port->partner_admin;
 583                 const struct port_params *oper = &port->partner_oper;
 584
 585                 /* check if any parameter is different then
 586                  * update the state machine selected variable.
 587                  */
 588                 if (admin->port_number != oper->port_number ||
 589                     admin->port_priority != oper->port_priority ||
 590                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 591                     admin->system_priority != oper->system_priority ||
 592                     admin->key != oper->key ||
 593                     (admin->port_state & LACP_STATE_AGGREGATION)
 594                         != (oper->port_state & LACP_STATE_AGGREGATION)) {
 595                         port->sm_vars &= ~AD_PORT_SELECTED;
 596                 }
 597         }
 598 }
 599
 600 /**
 601  * __update_ntt - update a port's ntt variable from a received lacpdu
 602  * @lacpdu: the lacpdu we've received
 603  * @port: the port we're looking at
 604  *
 605  * Updates the value of the ntt variable, using parameter values from a newly
 606  * received lacpdu. The parameter values for the partner carried in the
 607  * received PDU are compared with the corresponding operational parameter
 608  * values for the Actor. If one or more of the comparisons shows that the
 609  * value(s) received in the PDU differ from the current operational values,
 610  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 611  */
 612 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 613 {
 614         /* validate lacpdu and port */
 615         if (lacpdu && port) {
 616                 /* check if any parameter is different then
 617                  * update the port->ntt.
 618                  */
 619                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 620                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 621                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 622                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 623                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 624                     ((lacpdu->partner_state & LACP_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY)) ||
 625                     ((lacpdu->partner_state & LACP_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)) ||
 626                     ((lacpdu->partner_state & LACP_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) ||
 627                     ((lacpdu->partner_state & LACP_STATE_AGGREGATION) != (port->actor_oper_port_state & LACP_STATE_AGGREGATION))
 628                    ) {
 629                         port->ntt = true;
 630                 }
 631         }
 632 }
 633
 634 /**
 635  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 636  * @aggregator: the aggregator we're looking at
 637  *
 638  */
 639 static int __agg_ports_are_ready(struct aggregator *aggregator)
 640 {
 641         struct port *port;
 642         int retval = 1;
 643
 644         if (aggregator) {
 645                 /* scan all ports in this aggregator to verfy if they are
 646                  * all ready.
 647                  */
 648                 for (port = aggregator->lag_ports;
 649                      port;
 650                      port = port->next_port_in_aggregator) {
 651                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 652                                 retval = 0;
 653                                 break;
 654                         }
 655                 }
 656         }
 657
 658         return retval;
 659 }
 660
 661 /**
 662  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 663  * @aggregator: the aggregator we're looking at
 664  * @val: Should the ports' ready bit be set on or off
 665  *
 666  */
 667 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 668 {
 669         struct port *port;
 670
 671         for (port = aggregator->lag_ports; port;
 672              port = port->next_port_in_aggregator) {
 673                 if (val)
 674                         port->sm_vars |= AD_PORT_READY;
 675                 else
 676                         port->sm_vars &= ~AD_PORT_READY;
 677         }
 678 }
 679
 680 static int __agg_active_ports(struct aggregator *agg)
 681 {
 682         struct port *port;
 683         int active = 0;
 684
 685         for (port = agg->lag_ports; port;
 686              port = port->next_port_in_aggregator) {
 687                 if (port->is_enabled)
 688                         active++;
 689         }
 690
 691         return active;
 692 }
 693
 694 /**
 695  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 696  * @aggregator: the aggregator we're looking at
 697  *
 698  */
 699 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 700 {
 701         int nports = __agg_active_ports(aggregator);
 702         u32 bandwidth = 0;
 703
 704         if (nports) {
 705                 switch (__get_link_speed(aggregator->lag_ports)) {
 706                 case AD_LINK_SPEED_1MBPS:
 707                         bandwidth = nports;
 708                         break;
 709                 case AD_LINK_SPEED_10MBPS:
 710                         bandwidth = nports * 10;
 711                         break;
 712                 case AD_LINK_SPEED_100MBPS:
 713                         bandwidth = nports * 100;
 714                         break;
 715                 case AD_LINK_SPEED_1000MBPS:
 716                         bandwidth = nports * 1000;
 717                         break;
 718                 case AD_LINK_SPEED_2500MBPS:
 719                         bandwidth = nports * 2500;
 720                         break;
 721                 case AD_LINK_SPEED_5000MBPS:
 722                         bandwidth = nports * 5000;
 723                         break;
 724                 case AD_LINK_SPEED_10000MBPS:
 725                         bandwidth = nports * 10000;
 726                         break;
 727                 case AD_LINK_SPEED_14000MBPS:
 728                         bandwidth = nports * 14000;
 729                         break;
 730                 case AD_LINK_SPEED_20000MBPS:
 731                         bandwidth = nports * 20000;
 732                         break;
 733                 case AD_LINK_SPEED_25000MBPS:
 734                         bandwidth = nports * 25000;
 735                         break;
 736                 case AD_LINK_SPEED_40000MBPS:
 737                         bandwidth = nports * 40000;
 738                         break;
 739                 case AD_LINK_SPEED_50000MBPS:
 740                         bandwidth = nports * 50000;
 741                         break;
 742                 case AD_LINK_SPEED_56000MBPS:
 743                         bandwidth = nports * 56000;
 744                         break;
 745                 case AD_LINK_SPEED_100000MBPS:
 746                         bandwidth = nports * 100000;
 747                         break;
 748                 case AD_LINK_SPEED_200000MBPS:
 749                         bandwidth = nports * 200000;
 750                         break;
 751                 case AD_LINK_SPEED_400000MBPS:
 752                         bandwidth = nports * 400000;
 753                         break;
 754                 default:
 755                         bandwidth = 0; /* to silence the compiler */
 756                 }
 757         }
 758         return bandwidth;
 759 }
 760
 761 /**
 762  * __get_active_agg - get the current active aggregator
 763  * @aggregator: the aggregator we're looking at
 764  *
 765  * Caller must hold RCU lock.
 766  */
 767 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 768 {
 769         struct bonding *bond = aggregator->slave->bond;
 770         struct list_head *iter;
 771         struct slave *slave;
 772
 773         bond_for_each_slave_rcu(bond, slave, iter)
 774                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 775                         return &(SLAVE_AD_INFO(slave)->aggregator);
 776
 777         return NULL;
 778 }
 779
 780 /**
 781  * __update_lacpdu_from_port - update a port's lacpdu fields
 782  * @port: the port we're looking at
 783  */
 784 static inline void __update_lacpdu_from_port(struct port *port)
 785 {
 786         struct lacpdu *lacpdu = &port->lacpdu;
 787         const struct port_params *partner = &port->partner_oper;
 788
 789         /* update current actual Actor parameters
 790          * lacpdu->subtype                   initialized
 791          * lacpdu->version_number            initialized
 792          * lacpdu->tlv_type_actor_info       initialized
 793          * lacpdu->actor_information_length  initialized
 794          */
 795
 796         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 797         lacpdu->actor_system = port->actor_system;
 798         lacpdu->actor_key = htons(port->actor_oper_port_key);
 799         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 800         lacpdu->actor_port = htons(port->actor_port_number);
 801         lacpdu->actor_state = port->actor_oper_port_state;
 802         slave_dbg(port->slave->bond->dev, port->slave->dev,
 803                   "update lacpdu: actor port state %x\n",
 804                   port->actor_oper_port_state);
 805
 806         /* lacpdu->reserved_3_1              initialized
 807          * lacpdu->tlv_type_partner_info     initialized
 808          * lacpdu->partner_information_length initialized
 809          */
 810
 811         lacpdu->partner_system_priority = htons(partner->system_priority);
 812         lacpdu->partner_system = partner->system;
 813         lacpdu->partner_key = htons(partner->key);
 814         lacpdu->partner_port_priority = htons(partner->port_priority);
 815         lacpdu->partner_port = htons(partner->port_number);
 816         lacpdu->partner_state = partner->port_state;
 817
 818         /* lacpdu->reserved_3_2              initialized
 819          * lacpdu->tlv_type_collector_info   initialized
 820          * lacpdu->collector_information_length initialized
 821          * collector_max_delay                initialized
 822          * reserved_12[12]                   initialized
 823          * tlv_type_terminator               initialized
 824          * terminator_length                 initialized
 825          * reserved_50[50]                   initialized
 826          */
 827 }
 828
 829 /* ================= main 802.3ad protocol code ========================= */
 830
 831 /**
 832  * ad_lacpdu_send - send out a lacpdu packet on a given port
 833  * @port: the port we're looking at
 834  *
 835  * Returns:   0 on success
 836  *          < 0 on error
 837  */
 838 static int ad_lacpdu_send(struct port *port)
 839 {
 840         struct slave *slave = port->slave;
 841         struct sk_buff *skb;
 842         struct lacpdu_header *lacpdu_header;
 843         int length = sizeof(struct lacpdu_header);
 844
 845         skb = dev_alloc_skb(length);
 846         if (!skb)
 847                 return -ENOMEM;
 848
 849         atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx);
 850         atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx);
 851
 852         skb->dev = slave->dev;
 853         skb_reset_mac_header(skb);
 854         skb->network_header = skb->mac_header + ETH_HLEN;
 855         skb->protocol = PKT_TYPE_LACPDU;
 856         skb->priority = TC_PRIO_CONTROL;
 857
 858         lacpdu_header = skb_put(skb, length);
 859
 860         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 861         /* Note: source address is set to be the member's PERMANENT address,
 862          * because we use it to identify loopback lacpdus in receive.
 863          */
 864         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 865         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 866
 867         lacpdu_header->lacpdu = port->lacpdu;
 868
 869         dev_queue_xmit(skb);
 870
 871         return 0;
 872 }
 873
 874 /**
 875  * ad_marker_send - send marker information/response on a given port
 876  * @port: the port we're looking at
 877  * @marker: marker data to send
 878  *
 879  * Returns:   0 on success
 880  *          < 0 on error
 881  */
 882 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 883 {
 884         struct slave *slave = port->slave;
 885         struct sk_buff *skb;
 886         struct bond_marker_header *marker_header;
 887         int length = sizeof(struct bond_marker_header);
 888
 889         skb = dev_alloc_skb(length + 16);
 890         if (!skb)
 891                 return -ENOMEM;
 892
 893         switch (marker->tlv_type) {
 894         case AD_MARKER_INFORMATION_SUBTYPE:
 895                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx);
 896                 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx);
 897                 break;
 898         case AD_MARKER_RESPONSE_SUBTYPE:
 899                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx);
 900                 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx);
 901                 break;
 902         }
 903
 904         skb_reserve(skb, 16);
 905
 906         skb->dev = slave->dev;
 907         skb_reset_mac_header(skb);
 908         skb->network_header = skb->mac_header + ETH_HLEN;
 909         skb->protocol = PKT_TYPE_LACPDU;
 910
 911         marker_header = skb_put(skb, length);
 912
 913         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 914         /* Note: source address is set to be the member's PERMANENT address,
 915          * because we use it to identify loopback MARKERs in receive.
 916          */
 917         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 918         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 919
 920         marker_header->marker = *marker;
 921
 922         dev_queue_xmit(skb);
 923
 924         return 0;
 925 }
 926
 927 /**
 928  * ad_mux_machine - handle a port's mux state machine
 929  * @port: the port we're looking at
 930  * @update_slave_arr: Does slave array need update?
 931  */
 932 static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 933 {
 934         mux_states_t last_state;
 935
 936         /* keep current State Machine state to compare later if it was
 937          * changed
 938          */
 939         last_state = port->sm_mux_state;
 940
 941         if (port->sm_vars & AD_PORT_BEGIN) {
 942                 port->sm_mux_state = AD_MUX_DETACHED;
 943         } else {
 944                 switch (port->sm_mux_state) {
 945                 case AD_MUX_DETACHED:
 946                         if ((port->sm_vars & AD_PORT_SELECTED)
 947                             || (port->sm_vars & AD_PORT_STANDBY))
 948                                 /* if SELECTED or STANDBY */
 949                                 port->sm_mux_state = AD_MUX_WAITING;
 950                         break;
 951                 case AD_MUX_WAITING:
 952                         /* if SELECTED == FALSE return to DETACH state */
 953                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 954                                 port->sm_vars &= ~AD_PORT_READY_N;
 955                                 /* in order to withhold the Selection Logic to
 956                                  * check all ports READY_N value every callback
 957                                  * cycle to update ready variable, we check
 958                                  * READY_N and update READY here
 959                                  */
 960                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 961                                 port->sm_mux_state = AD_MUX_DETACHED;
 962                                 break;
 963                         }
 964
 965                         /* check if the wait_while_timer expired */
 966                         if (port->sm_mux_timer_counter
 967                             && !(--port->sm_mux_timer_counter))
 968                                 port->sm_vars |= AD_PORT_READY_N;
 969
 970                         /* in order to withhold the selection logic to check
 971                          * all ports READY_N value every callback cycle to
 972                          * update ready variable, we check READY_N and update
 973                          * READY here
 974                          */
 975                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 976
 977                         /* if the wait_while_timer expired, and the port is
 978                          * in READY state, move to ATTACHED state
 979                          */
 980                         if ((port->sm_vars & AD_PORT_READY)
 981                             && !port->sm_mux_timer_counter)
 982                                 port->sm_mux_state = AD_MUX_ATTACHED;
 983                         break;
 984                 case AD_MUX_ATTACHED:
 985                         /* check also if agg_select_timer expired (so the
 986                          * edable port will take place only after this timer)
 987                          */
 988                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 989                             (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
 990                             !__check_agg_selection_timer(port)) {
 991                                 if (port->aggregator->is_active)
 992                                         port->sm_mux_state =
 993                                             AD_MUX_COLLECTING_DISTRIBUTING;
 994                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 995                                    (port->sm_vars & AD_PORT_STANDBY)) {
 996                                 /* if UNSELECTED or STANDBY */
 997                                 port->sm_vars &= ~AD_PORT_READY_N;
 998                                 /* in order to withhold the selection logic to
 999                                  * check all ports READY_N value every callback
1000                                  * cycle to update ready variable, we check
1001                                  * READY_N and update READY here
1002                                  */
1003                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1004                                 port->sm_mux_state = AD_MUX_DETACHED;
1005                         } else if (port->aggregator->is_active) {
1006                                 port->actor_oper_port_state |=
1007                                     LACP_STATE_SYNCHRONIZATION;
1008                         }
1009                         break;
1010                 case AD_MUX_COLLECTING_DISTRIBUTING:
1011                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
1012                             (port->sm_vars & AD_PORT_STANDBY) ||
1013                             !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
1014                             !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) {
1015                                 port->sm_mux_state = AD_MUX_ATTACHED;
1016                         } else {
1017                                 /* if port state hasn't changed make
1018                                  * sure that a collecting distributing
1019                                  * port in an active aggregator is enabled
1020                                  */
1021                                 if (port->aggregator &&
1022                                     port->aggregator->is_active &&
1023                                     !__port_is_enabled(port)) {
1024                                         __enable_port(port);
1025                                         *update_slave_arr = true;
1026                                 }
1027                         }
1028                         break;
1029                 default:
1030                         break;
1031                 }
1032         }
1033
1034         /* check if the state machine was changed */
1035         if (port->sm_mux_state != last_state) {
1036                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1037                           "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
1038                           port->actor_port_number,
1039                           last_state,
1040                           port->sm_mux_state);
1041                 switch (port->sm_mux_state) {
1042                 case AD_MUX_DETACHED:
1043                         port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1044                         ad_disable_collecting_distributing(port,
1045                                                            update_slave_arr);
1046                         port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1047                         port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1048                         port->ntt = true;
1049                         break;
1050                 case AD_MUX_WAITING:
1051                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1052                         break;
1053                 case AD_MUX_ATTACHED:
1054                         if (port->aggregator->is_active)
1055                                 port->actor_oper_port_state |=
1056                                     LACP_STATE_SYNCHRONIZATION;
1057                         else
1058                                 port->actor_oper_port_state &=
1059                                     ~LACP_STATE_SYNCHRONIZATION;
1060                         port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1061                         port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1062                         ad_disable_collecting_distributing(port,
1063                                                            update_slave_arr);
1064                         port->ntt = true;
1065                         break;
1066                 case AD_MUX_COLLECTING_DISTRIBUTING:
1067                         port->actor_oper_port_state |= LACP_STATE_COLLECTING;
1068                         port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
1069                         port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
1070                         ad_enable_collecting_distributing(port,
1071                                                           update_slave_arr);
1072                         port->ntt = true;
1073                         break;
1074                 default:
1075                         break;
1076                 }
1077         }
1078 }
1079
1080 /**
1081  * ad_rx_machine - handle a port's rx State Machine
1082  * @lacpdu: the lacpdu we've received
1083  * @port: the port we're looking at
1084  *
1085  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1086  * CURRENT. If timer expired set the state machine in the proper state.
1087  * In other cases, this function checks if we need to switch to other state.
1088  */
1089 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1090 {
1091         rx_states_t last_state;
1092
1093         /* keep current State Machine state to compare later if it was
1094          * changed
1095          */
1096         last_state = port->sm_rx_state;
1097
1098         if (lacpdu) {
1099                 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx);
1100                 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx);
1101         }
1102         /* check if state machine should change state */
1103
1104         /* first, check if port was reinitialized */
1105         if (port->sm_vars & AD_PORT_BEGIN) {
1106                 port->sm_rx_state = AD_RX_INITIALIZE;
1107                 port->sm_vars |= AD_PORT_CHURNED;
1108         /* check if port is not enabled */
1109         } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled)
1110                 port->sm_rx_state = AD_RX_PORT_DISABLED;
1111         /* check if new lacpdu arrived */
1112         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1113                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
1114                  (port->sm_rx_state == AD_RX_CURRENT))) {
1115                 if (port->sm_rx_state != AD_RX_CURRENT)
1116                         port->sm_vars |= AD_PORT_CHURNED;
1117                 port->sm_rx_timer_counter = 0;
1118                 port->sm_rx_state = AD_RX_CURRENT;
1119         } else {
1120                 /* if timer is on, and if it is expired */
1121                 if (port->sm_rx_timer_counter &&
1122                     !(--port->sm_rx_timer_counter)) {
1123                         switch (port->sm_rx_state) {
1124                         case AD_RX_EXPIRED:
1125                                 port->sm_rx_state = AD_RX_DEFAULTED;
1126                                 break;
1127                         case AD_RX_CURRENT:
1128                                 port->sm_rx_state = AD_RX_EXPIRED;
1129                                 break;
1130                         default:
1131                                 break;
1132                         }
1133                 } else {
1134                         /* if no lacpdu arrived and no timer is on */
1135                         switch (port->sm_rx_state) {
1136                         case AD_RX_PORT_DISABLED:
1137                                 if (port->is_enabled &&
1138                                     (port->sm_vars & AD_PORT_LACP_ENABLED))
1139                                         port->sm_rx_state = AD_RX_EXPIRED;
1140                                 else if (port->is_enabled
1141                                          && ((port->sm_vars
1142                                               & AD_PORT_LACP_ENABLED) == 0))
1143                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
1144                                 break;
1145                         default:
1146                                 break;
1147
1148                         }
1149                 }
1150         }
1151
1152         /* check if the State machine was changed or new lacpdu arrived */
1153         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1154                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1155                           "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1156                           port->actor_port_number,
1157                           last_state,
1158                           port->sm_rx_state);
1159                 switch (port->sm_rx_state) {
1160                 case AD_RX_INITIALIZE:
1161                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1162                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1163                         else
1164                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1165                         port->sm_vars &= ~AD_PORT_SELECTED;
1166                         __record_default(port);
1167                         port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1168                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1169
1170                         fallthrough;
1171                 case AD_RX_PORT_DISABLED:
1172                         port->sm_vars &= ~AD_PORT_MATCHED;
1173                         break;
1174                 case AD_RX_LACP_DISABLED:
1175                         port->sm_vars &= ~AD_PORT_SELECTED;
1176                         __record_default(port);
1177                         port->partner_oper.port_state &= ~LACP_STATE_AGGREGATION;
1178                         port->sm_vars |= AD_PORT_MATCHED;
1179                         port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1180                         break;
1181                 case AD_RX_EXPIRED:
1182                         /* Reset of the Synchronization flag (Standard 43.4.12)
1183                          * This reset cause to disable this port in the
1184                          * COLLECTING_DISTRIBUTING state of the mux machine in
1185                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1186                          * the port.
1187                          */
1188                         port->partner_oper.port_state &= ~LACP_STATE_SYNCHRONIZATION;
1189                         port->sm_vars &= ~AD_PORT_MATCHED;
1190                         port->partner_oper.port_state |= LACP_STATE_LACP_TIMEOUT;
1191                         port->partner_oper.port_state |= LACP_STATE_LACP_ACTIVITY;
1192                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1193                         port->actor_oper_port_state |= LACP_STATE_EXPIRED;
1194                         port->sm_vars |= AD_PORT_CHURNED;
1195                         break;
1196                 case AD_RX_DEFAULTED:
1197                         __update_default_selected(port);
1198                         __record_default(port);
1199                         port->sm_vars |= AD_PORT_MATCHED;
1200                         port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1201                         break;
1202                 case AD_RX_CURRENT:
1203                         /* detect loopback situation */
1204                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1205                                               &(port->actor_system))) {
1206                                 slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n"
1207                                           "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n");
1208                                 return;
1209                         }
1210                         __update_selected(lacpdu, port);
1211                         __update_ntt(lacpdu, port);
1212                         __record_pdu(lacpdu, port);
1213                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT));
1214                         port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1215                         break;
1216                 default:
1217                         break;
1218                 }
1219         }
1220 }
1221
1222 /**
1223  * ad_churn_machine - handle port churn's state machine
1224  * @port: the port we're looking at
1225  *
1226  */
1227 static void ad_churn_machine(struct port *port)
1228 {
1229         if (port->sm_vars & AD_PORT_CHURNED) {
1230                 port->sm_vars &= ~AD_PORT_CHURNED;
1231                 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1232                 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1233                 port->sm_churn_actor_timer_counter =
1234                         __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1235                 port->sm_churn_partner_timer_counter =
1236                          __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1237                 return;
1238         }
1239         if (port->sm_churn_actor_timer_counter &&
1240             !(--port->sm_churn_actor_timer_counter) &&
1241             port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1242                 if (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION) {
1243                         port->sm_churn_actor_state = AD_NO_CHURN;
1244                 } else {
1245                         port->churn_actor_count++;
1246                         port->sm_churn_actor_state = AD_CHURN;
1247                 }
1248         }
1249         if (port->sm_churn_partner_timer_counter &&
1250             !(--port->sm_churn_partner_timer_counter) &&
1251             port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1252                 if (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) {
1253                         port->sm_churn_partner_state = AD_NO_CHURN;
1254                 } else {
1255                         port->churn_partner_count++;
1256                         port->sm_churn_partner_state = AD_CHURN;
1257                 }
1258         }
1259 }
1260
1261 /**
1262  * ad_tx_machine - handle a port's tx state machine
1263  * @port: the port we're looking at
1264  */
1265 static void ad_tx_machine(struct port *port)
1266 {
1267         /* check if tx timer expired, to verify that we do not send more than
1268          * 3 packets per second
1269          */
1270         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1271                 /* check if there is something to send */
1272                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1273                         __update_lacpdu_from_port(port);
1274
1275                         if (ad_lacpdu_send(port) >= 0) {
1276                                 slave_dbg(port->slave->bond->dev,
1277                                           port->slave->dev,
1278                                           "Sent LACPDU on port %d\n",
1279                                           port->actor_port_number);
1280
1281                                 /* mark ntt as false, so it will not be sent
1282                                  * again until demanded
1283                                  */
1284                                 port->ntt = false;
1285                         }
1286                 }
1287                 /* restart tx timer(to verify that we will not exceed
1288                  * AD_MAX_TX_IN_SECOND
1289                  */
1290                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1291         }
1292 }
1293
1294 /**
1295  * ad_periodic_machine - handle a port's periodic state machine
1296  * @port: the port we're looking at
1297  * @bond_params: bond parameters we will use
1298  *
1299  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1300  */
1301 static void ad_periodic_machine(struct port *port, struct bond_params *bond_params)
1302 {
1303         periodic_states_t last_state;
1304
1305         /* keep current state machine state to compare later if it was changed */
1306         last_state = port->sm_periodic_state;
1307
1308         /* check if port was reinitialized */
1309         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1310             (!(port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & LACP_STATE_LACP_ACTIVITY)) ||
1311             !bond_params->lacp_active) {
1312                 port->sm_periodic_state = AD_NO_PERIODIC;
1313         }
1314         /* check if state machine should change state */
1315         else if (port->sm_periodic_timer_counter) {
1316                 /* check if periodic state machine expired */
1317                 if (!(--port->sm_periodic_timer_counter)) {
1318                         /* if expired then do tx */
1319                         port->sm_periodic_state = AD_PERIODIC_TX;
1320                 } else {
1321                         /* If not expired, check if there is some new timeout
1322                          * parameter from the partner state
1323                          */
1324                         switch (port->sm_periodic_state) {
1325                         case AD_FAST_PERIODIC:
1326                                 if (!(port->partner_oper.port_state
1327                                       & LACP_STATE_LACP_TIMEOUT))
1328                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1329                                 break;
1330                         case AD_SLOW_PERIODIC:
1331                                 if ((port->partner_oper.port_state & LACP_STATE_LACP_TIMEOUT)) {
1332                                         port->sm_periodic_timer_counter = 0;
1333                                         port->sm_periodic_state = AD_PERIODIC_TX;
1334                                 }
1335                                 break;
1336                         default:
1337                                 break;
1338                         }
1339                 }
1340         } else {
1341                 switch (port->sm_periodic_state) {
1342                 case AD_NO_PERIODIC:
1343                         port->sm_periodic_state = AD_FAST_PERIODIC;
1344                         break;
1345                 case AD_PERIODIC_TX:
1346                         if (!(port->partner_oper.port_state &
1347                             LACP_STATE_LACP_TIMEOUT))
1348                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1349                         else
1350                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1351                         break;
1352                 default:
1353                         break;
1354                 }
1355         }
1356
1357         /* check if the state machine was changed */
1358         if (port->sm_periodic_state != last_state) {
1359                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1360                           "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1361                           port->actor_port_number, last_state,
1362                           port->sm_periodic_state);
1363                 switch (port->sm_periodic_state) {
1364                 case AD_NO_PERIODIC:
1365                         port->sm_periodic_timer_counter = 0;
1366                         break;
1367                 case AD_FAST_PERIODIC:
1368                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1369                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1370                         break;
1371                 case AD_SLOW_PERIODIC:
1372                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1373                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1374                         break;
1375                 case AD_PERIODIC_TX:
1376                         port->ntt = true;
1377                         break;
1378                 default:
1379                         break;
1380                 }
1381         }
1382 }
1383
1384 /**
1385  * ad_port_selection_logic - select aggregation groups
1386  * @port: the port we're looking at
1387  * @update_slave_arr: Does slave array need update?
1388  *
1389  * Select aggregation groups, and assign each port for it's aggregetor. The
1390  * selection logic is called in the inititalization (after all the handshkes),
1391  * and after every lacpdu receive (if selected is off).
1392  */
1393 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1394 {
1395         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1396         struct port *last_port = NULL, *curr_port;
1397         struct list_head *iter;
1398         struct bonding *bond;
1399         struct slave *slave;
1400         int found = 0;
1401
1402         /* if the port is already Selected, do nothing */
1403         if (port->sm_vars & AD_PORT_SELECTED)
1404                 return;
1405
1406         bond = __get_bond_by_port(port);
1407
1408         /* if the port is connected to other aggregator, detach it */
1409         if (port->aggregator) {
1410                 /* detach the port from its former aggregator */
1411                 temp_aggregator = port->aggregator;
1412                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1413                      last_port = curr_port,
1414                      curr_port = curr_port->next_port_in_aggregator) {
1415                         if (curr_port == port) {
1416                                 temp_aggregator->num_of_ports--;
1417                                 /* if it is the first port attached to the
1418                                  * aggregator
1419                                  */
1420                                 if (!last_port) {
1421                                         temp_aggregator->lag_ports =
1422                                                 port->next_port_in_aggregator;
1423                                 } else {
1424                                         /* not the first port attached to the
1425                                          * aggregator
1426                                          */
1427                                         last_port->next_port_in_aggregator =
1428                                                 port->next_port_in_aggregator;
1429                                 }
1430
1431                                 /* clear the port's relations to this
1432                                  * aggregator
1433                                  */
1434                                 port->aggregator = NULL;
1435                                 port->next_port_in_aggregator = NULL;
1436                                 port->actor_port_aggregator_identifier = 0;
1437
1438                                 slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n",
1439                                           port->actor_port_number,
1440                                           temp_aggregator->aggregator_identifier);
1441                                 /* if the aggregator is empty, clear its
1442                                  * parameters, and set it ready to be attached
1443                                  */
1444                                 if (!temp_aggregator->lag_ports)
1445                                         ad_clear_agg(temp_aggregator);
1446                                 break;
1447                         }
1448                 }
1449                 if (!curr_port) {
1450                         /* meaning: the port was related to an aggregator
1451                          * but was not on the aggregator port list
1452                          */
1453                         net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n",
1454                                              port->slave->bond->dev->name,
1455                                              port->slave->dev->name,
1456                                              port->actor_port_number,
1457                                              port->aggregator->aggregator_identifier);
1458                 }
1459         }
1460         /* search on all aggregators for a suitable aggregator for this port */
1461         bond_for_each_slave(bond, slave, iter) {
1462                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1463
1464                 /* keep a free aggregator for later use(if needed) */
1465                 if (!aggregator->lag_ports) {
1466                         if (!free_aggregator)
1467                                 free_aggregator = aggregator;
1468                         continue;
1469                 }
1470                 /* check if current aggregator suits us */
1471                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1472                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1473                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1474                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1475                     ) &&
1476                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1477                       !aggregator->is_individual)  /* but is not individual OR */
1478                     )
1479                    ) {
1480                         /* attach to the founded aggregator */
1481                         port->aggregator = aggregator;
1482                         port->actor_port_aggregator_identifier =
1483                                 port->aggregator->aggregator_identifier;
1484                         port->next_port_in_aggregator = aggregator->lag_ports;
1485                         port->aggregator->num_of_ports++;
1486                         aggregator->lag_ports = port;
1487                         slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n",
1488                                   port->actor_port_number,
1489                                   port->aggregator->aggregator_identifier);
1490
1491                         /* mark this port as selected */
1492                         port->sm_vars |= AD_PORT_SELECTED;
1493                         found = 1;
1494                         break;
1495                 }
1496         }
1497
1498         /* the port couldn't find an aggregator - attach it to a new
1499          * aggregator
1500          */
1501         if (!found) {
1502                 if (free_aggregator) {
1503                         /* assign port a new aggregator */
1504                         port->aggregator = free_aggregator;
1505                         port->actor_port_aggregator_identifier =
1506                                 port->aggregator->aggregator_identifier;
1507
1508                         /* update the new aggregator's parameters
1509                          * if port was responsed from the end-user
1510                          */
1511                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1512                                 /* if port is full duplex */
1513                                 port->aggregator->is_individual = false;
1514                         else
1515                                 port->aggregator->is_individual = true;
1516
1517                         port->aggregator->actor_admin_aggregator_key =
1518                                 port->actor_admin_port_key;
1519                         port->aggregator->actor_oper_aggregator_key =
1520                                 port->actor_oper_port_key;
1521                         port->aggregator->partner_system =
1522                                 port->partner_oper.system;
1523                         port->aggregator->partner_system_priority =
1524                                 port->partner_oper.system_priority;
1525                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1526                         port->aggregator->receive_state = 1;
1527                         port->aggregator->transmit_state = 1;
1528                         port->aggregator->lag_ports = port;
1529                         port->aggregator->num_of_ports++;
1530
1531                         /* mark this port as selected */
1532                         port->sm_vars |= AD_PORT_SELECTED;
1533
1534                         slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n",
1535                                   port->actor_port_number,
1536                                   port->aggregator->aggregator_identifier);
1537                 } else {
1538                         slave_err(bond->dev, port->slave->dev,
1539                                   "Port %d did not find a suitable aggregator\n",
1540                                   port->actor_port_number);
1541                 }
1542         }
1543         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1544          * in all aggregator's ports, else set ready=FALSE in all
1545          * aggregator's ports
1546          */
1547         __set_agg_ports_ready(port->aggregator,
1548                               __agg_ports_are_ready(port->aggregator));
1549
1550         aggregator = __get_first_agg(port);
1551         ad_agg_selection_logic(aggregator, update_slave_arr);
1552
1553         if (!port->aggregator->is_active)
1554                 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1555 }
1556
1557 /* Decide if "agg" is a better choice for the new active aggregator that
1558  * the current best, according to the ad_select policy.
1559  */
1560 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1561                                                 struct aggregator *curr)
1562 {
1563         /* 0. If no best, select current.
1564          *
1565          * 1. If the current agg is not individual, and the best is
1566          *    individual, select current.
1567          *
1568          * 2. If current agg is individual and the best is not, keep best.
1569          *
1570          * 3. Therefore, current and best are both individual or both not
1571          *    individual, so:
1572          *
1573          * 3a. If current agg partner replied, and best agg partner did not,
1574          *     select current.
1575          *
1576          * 3b. If current agg partner did not reply and best agg partner
1577          *     did reply, keep best.
1578          *
1579          * 4.  Therefore, current and best both have partner replies or
1580          *     both do not, so perform selection policy:
1581          *
1582          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1583          *     select by bandwidth.
1584          *
1585          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1586          */
1587         if (!best)
1588                 return curr;
1589
1590         if (!curr->is_individual && best->is_individual)
1591                 return curr;
1592
1593         if (curr->is_individual && !best->is_individual)
1594                 return best;
1595
1596         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1597                 return curr;
1598
1599         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1600                 return best;
1601
1602         switch (__get_agg_selection_mode(curr->lag_ports)) {
1603         case BOND_AD_COUNT:
1604                 if (__agg_active_ports(curr) > __agg_active_ports(best))
1605                         return curr;
1606
1607                 if (__agg_active_ports(curr) < __agg_active_ports(best))
1608                         return best;
1609
1610                 fallthrough;
1611         case BOND_AD_STABLE:
1612         case BOND_AD_BANDWIDTH:
1613                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1614                         return curr;
1615
1616                 break;
1617
1618         default:
1619                 net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n",
1620                                      curr->slave->bond->dev->name,
1621                                      curr->slave->dev->name,
1622                                      __get_agg_selection_mode(curr->lag_ports));
1623                 break;
1624         }
1625
1626         return best;
1627 }
1628
1629 static int agg_device_up(const struct aggregator *agg)
1630 {
1631         struct port *port = agg->lag_ports;
1632
1633         if (!port)
1634                 return 0;
1635
1636         for (port = agg->lag_ports; port;
1637              port = port->next_port_in_aggregator) {
1638                 if (netif_running(port->slave->dev) &&
1639                     netif_carrier_ok(port->slave->dev))
1640                         return 1;
1641         }
1642
1643         return 0;
1644 }
1645
1646 /**
1647  * ad_agg_selection_logic - select an aggregation group for a team
1648  * @agg: the aggregator we're looking at
1649  * @update_slave_arr: Does slave array need update?
1650  *
1651  * It is assumed that only one aggregator may be selected for a team.
1652  *
1653  * The logic of this function is to select the aggregator according to
1654  * the ad_select policy:
1655  *
1656  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1657  * it, and to reselect the active aggregator only if the previous
1658  * aggregator has no more ports related to it.
1659  *
1660  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1661  * bandwidth, and reselect whenever a link state change takes place or the
1662  * set of slaves in the bond changes.
1663  *
1664  * BOND_AD_COUNT: select the aggregator with largest number of ports
1665  * (slaves), and reselect whenever a link state change takes place or the
1666  * set of slaves in the bond changes.
1667  *
1668  * FIXME: this function MUST be called with the first agg in the bond, or
1669  * __get_active_agg() won't work correctly. This function should be better
1670  * called with the bond itself, and retrieve the first agg from it.
1671  */
1672 static void ad_agg_selection_logic(struct aggregator *agg,
1673                                    bool *update_slave_arr)
1674 {
1675         struct aggregator *best, *active, *origin;
1676         struct bonding *bond = agg->slave->bond;
1677         struct list_head *iter;
1678         struct slave *slave;
1679         struct port *port;
1680
1681         rcu_read_lock();
1682         origin = agg;
1683         active = __get_active_agg(agg);
1684         best = (active && agg_device_up(active)) ? active : NULL;
1685
1686         bond_for_each_slave_rcu(bond, slave, iter) {
1687                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1688
1689                 agg->is_active = 0;
1690
1691                 if (__agg_active_ports(agg) && agg_device_up(agg))
1692                         best = ad_agg_selection_test(best, agg);
1693         }
1694
1695         if (best &&
1696             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1697                 /* For the STABLE policy, don't replace the old active
1698                  * aggregator if it's still active (it has an answering
1699                  * partner) or if both the best and active don't have an
1700                  * answering partner.
1701                  */
1702                 if (active && active->lag_ports &&
1703                     __agg_active_ports(active) &&
1704                     (__agg_has_partner(active) ||
1705                      (!__agg_has_partner(active) &&
1706                      !__agg_has_partner(best)))) {
1707                         if (!(!active->actor_oper_aggregator_key &&
1708                               best->actor_oper_aggregator_key)) {
1709                                 best = NULL;
1710                                 active->is_active = 1;
1711                         }
1712                 }
1713         }
1714
1715         if (best && (best == active)) {
1716                 best = NULL;
1717                 active->is_active = 1;
1718         }
1719
1720         /* if there is new best aggregator, activate it */
1721         if (best) {
1722                 netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1723                            best->slave ? best->slave->dev->name : "NULL",
1724                            best->aggregator_identifier, best->num_of_ports,
1725                            best->actor_oper_aggregator_key,
1726                            best->partner_oper_aggregator_key,
1727                            best->is_individual, best->is_active);
1728                 netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n",
1729                            best->slave ? best->slave->dev->name : "NULL",
1730                            best->lag_ports, best->slave);
1731
1732                 bond_for_each_slave_rcu(bond, slave, iter) {
1733                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1734
1735                         slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1736                                   agg->aggregator_identifier, agg->num_of_ports,
1737                                   agg->actor_oper_aggregator_key,
1738                                   agg->partner_oper_aggregator_key,
1739                                   agg->is_individual, agg->is_active);
1740                 }
1741
1742                 /* check if any partner replies */
1743                 if (best->is_individual)
1744                         net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1745                                              bond->dev->name);
1746
1747                 best->is_active = 1;
1748                 netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n",
1749                            best->slave ? best->slave->dev->name : "NULL",
1750                            best->aggregator_identifier);
1751                 netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1752                            best->slave ? best->slave->dev->name : "NULL",
1753                            best->aggregator_identifier, best->num_of_ports,
1754                            best->actor_oper_aggregator_key,
1755                            best->partner_oper_aggregator_key,
1756                            best->is_individual, best->is_active);
1757
1758                 /* disable the ports that were related to the former
1759                  * active_aggregator
1760                  */
1761                 if (active) {
1762                         for (port = active->lag_ports; port;
1763                              port = port->next_port_in_aggregator) {
1764                                 __disable_port(port);
1765                         }
1766                 }
1767                 /* Slave array needs update. */
1768                 *update_slave_arr = true;
1769         }
1770
1771         /* if the selected aggregator is of join individuals
1772          * (partner_system is NULL), enable their ports
1773          */
1774         active = __get_active_agg(origin);
1775
1776         if (active) {
1777                 if (!__agg_has_partner(active)) {
1778                         for (port = active->lag_ports; port;
1779                              port = port->next_port_in_aggregator) {
1780                                 __enable_port(port);
1781                         }
1782                         *update_slave_arr = true;
1783                 }
1784         }
1785
1786         rcu_read_unlock();
1787
1788         bond_3ad_set_carrier(bond);
1789 }
1790
1791 /**
1792  * ad_clear_agg - clear a given aggregator's parameters
1793  * @aggregator: the aggregator we're looking at
1794  */
1795 static void ad_clear_agg(struct aggregator *aggregator)
1796 {
1797         if (aggregator) {
1798                 aggregator->is_individual = false;
1799                 aggregator->actor_admin_aggregator_key = 0;
1800                 aggregator->actor_oper_aggregator_key = 0;
1801                 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1802                 aggregator->partner_system_priority = 0;
1803                 aggregator->partner_oper_aggregator_key = 0;
1804                 aggregator->receive_state = 0;
1805                 aggregator->transmit_state = 0;
1806                 aggregator->lag_ports = NULL;
1807                 aggregator->is_active = 0;
1808                 aggregator->num_of_ports = 0;
1809                 pr_debug("%s: LAG %d was cleared\n",
1810                          aggregator->slave ?
1811                          aggregator->slave->dev->name : "NULL",
1812                          aggregator->aggregator_identifier);
1813         }
1814 }
1815
1816 /**
1817  * ad_initialize_agg - initialize a given aggregator's parameters
1818  * @aggregator: the aggregator we're looking at
1819  */
1820 static void ad_initialize_agg(struct aggregator *aggregator)
1821 {
1822         if (aggregator) {
1823                 ad_clear_agg(aggregator);
1824
1825                 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1826                 aggregator->aggregator_identifier = 0;
1827                 aggregator->slave = NULL;
1828         }
1829 }
1830
1831 /**
1832  * ad_initialize_port - initialize a given port's parameters
1833  * @port: the port we're looking at
1834  * @lacp_fast: boolean. whether fast periodic should be used
1835  */
1836 static void ad_initialize_port(struct port *port, int lacp_fast)
1837 {
1838         static const struct port_params tmpl = {
1839                 .system_priority = 0xffff,
1840                 .key             = 1,
1841                 .port_number     = 1,
1842                 .port_priority   = 0xff,
1843                 .port_state      = 1,
1844         };
1845         static const struct lacpdu lacpdu = {
1846                 .subtype                = 0x01,
1847                 .version_number = 0x01,
1848                 .tlv_type_actor_info = 0x01,
1849                 .actor_information_length = 0x14,
1850                 .tlv_type_partner_info = 0x02,
1851                 .partner_information_length = 0x14,
1852                 .tlv_type_collector_info = 0x03,
1853                 .collector_information_length = 0x10,
1854                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1855         };
1856
1857         if (port) {
1858                 port->actor_port_priority = 0xff;
1859                 port->actor_port_aggregator_identifier = 0;
1860                 port->ntt = false;
1861                 port->actor_admin_port_state = LACP_STATE_AGGREGATION |
1862                                                LACP_STATE_LACP_ACTIVITY;
1863                 port->actor_oper_port_state  = LACP_STATE_AGGREGATION |
1864                                                LACP_STATE_LACP_ACTIVITY;
1865
1866                 if (lacp_fast)
1867                         port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
1868
1869                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1870                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1871
1872                 port->is_enabled = true;
1873                 /* private parameters */
1874                 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1875                 port->sm_rx_state = 0;
1876                 port->sm_rx_timer_counter = 0;
1877                 port->sm_periodic_state = 0;
1878                 port->sm_periodic_timer_counter = 0;
1879                 port->sm_mux_state = 0;
1880                 port->sm_mux_timer_counter = 0;
1881                 port->sm_tx_state = 0;
1882                 port->aggregator = NULL;
1883                 port->next_port_in_aggregator = NULL;
1884                 port->transaction_id = 0;
1885
1886                 port->sm_churn_actor_timer_counter = 0;
1887                 port->sm_churn_actor_state = 0;
1888                 port->churn_actor_count = 0;
1889                 port->sm_churn_partner_timer_counter = 0;
1890                 port->sm_churn_partner_state = 0;
1891                 port->churn_partner_count = 0;
1892
1893                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1894         }
1895 }
1896
1897 /**
1898  * ad_enable_collecting_distributing - enable a port's transmit/receive
1899  * @port: the port we're looking at
1900  * @update_slave_arr: Does slave array need update?
1901  *
1902  * Enable @port if it's in an active aggregator
1903  */
1904 static void ad_enable_collecting_distributing(struct port *port,
1905                                               bool *update_slave_arr)
1906 {
1907         if (port->aggregator->is_active) {
1908                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1909                           "Enabling port %d (LAG %d)\n",
1910                           port->actor_port_number,
1911                           port->aggregator->aggregator_identifier);
1912                 __enable_port(port);
1913                 /* Slave array needs update */
1914                 *update_slave_arr = true;
1915         }
1916 }
1917
1918 /**
1919  * ad_disable_collecting_distributing - disable a port's transmit/receive
1920  * @port: the port we're looking at
1921  * @update_slave_arr: Does slave array need update?
1922  */
1923 static void ad_disable_collecting_distributing(struct port *port,
1924                                                bool *update_slave_arr)
1925 {
1926         if (port->aggregator &&
1927             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1928                                &(null_mac_addr))) {
1929                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1930                           "Disabling port %d (LAG %d)\n",
1931                           port->actor_port_number,
1932                           port->aggregator->aggregator_identifier);
1933                 __disable_port(port);
1934                 /* Slave array needs an update */
1935                 *update_slave_arr = true;
1936         }
1937 }
1938
1939 /**
1940  * ad_marker_info_received - handle receive of a Marker information frame
1941  * @marker_info: Marker info received
1942  * @port: the port we're looking at
1943  */
1944 static void ad_marker_info_received(struct bond_marker *marker_info,
1945                                     struct port *port)
1946 {
1947         struct bond_marker marker;
1948
1949         atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx);
1950         atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx);
1951
1952         /* copy the received marker data to the response marker */
1953         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1954         /* change the marker subtype to marker response */
1955         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1956
1957         /* send the marker response */
1958         if (ad_marker_send(port, &marker) >= 0)
1959                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1960                           "Sent Marker Response on port %d\n",
1961                           port->actor_port_number);
1962 }
1963
1964 /**
1965  * ad_marker_response_received - handle receive of a marker response frame
1966  * @marker: marker PDU received
1967  * @port: the port we're looking at
1968  *
1969  * This function does nothing since we decided not to implement send and handle
1970  * response for marker PDU's, in this stage, but only to respond to marker
1971  * information.
1972  */
1973 static void ad_marker_response_received(struct bond_marker *marker,
1974                                         struct port *port)
1975 {
1976         atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx);
1977         atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx);
1978
1979         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1980 }
1981
1982 /* ========= AD exported functions to the main bonding code ========= */
1983
1984 /* Check aggregators status in team every T seconds */
1985 #define AD_AGGREGATOR_SELECTION_TIMER  8
1986
1987 /**
1988  * bond_3ad_initiate_agg_selection - initate aggregator selection
1989  * @bond: bonding struct
1990  * @timeout: timeout value to set
1991  *
1992  * Set the aggregation selection timer, to initiate an agg selection in
1993  * the very near future.  Called during first initialization, and during
1994  * any down to up transitions of the bond.
1995  */
1996 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1997 {
1998         atomic_set(&BOND_AD_INFO(bond).agg_select_timer, timeout);
1999 }
2000
2001 /**
2002  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
2003  * @bond: bonding struct to work on
2004  * @tick_resolution: tick duration (millisecond resolution)
2005  *
2006  * Can be called only after the mac address of the bond is set.
2007  */
2008 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
2009 {
2010         /* check that the bond is not initialized yet */
2011         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
2012                                 bond->dev->dev_addr)) {
2013
2014                 BOND_AD_INFO(bond).aggregator_identifier = 0;
2015
2016                 BOND_AD_INFO(bond).system.sys_priority =
2017                         bond->params.ad_actor_sys_prio;
2018                 if (is_zero_ether_addr(bond->params.ad_actor_system))
2019                         BOND_AD_INFO(bond).system.sys_mac_addr =
2020                             *((struct mac_addr *)bond->dev->dev_addr);
2021                 else
2022                         BOND_AD_INFO(bond).system.sys_mac_addr =
2023                             *((struct mac_addr *)bond->params.ad_actor_system);
2024
2025                 /* initialize how many times this module is called in one
2026                  * second (should be about every 100ms)
2027                  */
2028                 ad_ticks_per_sec = tick_resolution;
2029
2030                 bond_3ad_initiate_agg_selection(bond,
2031                                                 AD_AGGREGATOR_SELECTION_TIMER *
2032                                                 ad_ticks_per_sec);
2033         }
2034 }
2035
2036 /**
2037  * bond_3ad_bind_slave - initialize a slave's port
2038  * @slave: slave struct to work on
2039  *
2040  * Returns:   0 on success
2041  *          < 0 on error
2042  */
2043 void bond_3ad_bind_slave(struct slave *slave)
2044 {
2045         struct bonding *bond = bond_get_bond_by_slave(slave);
2046         struct port *port;
2047         struct aggregator *aggregator;
2048
2049         /* check that the slave has not been initialized yet. */
2050         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
2051
2052                 /* port initialization */
2053                 port = &(SLAVE_AD_INFO(slave)->port);
2054
2055                 ad_initialize_port(port, bond->params.lacp_fast);
2056
2057                 port->slave = slave;
2058                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
2059                 /* key is determined according to the link speed, duplex and
2060                  * user key
2061                  */
2062                 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
2063                 ad_update_actor_keys(port, false);
2064                 /* actor system is the bond's system */
2065                 __ad_actor_update_port(port);
2066                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2067                  * lacpdu's are sent in one second)
2068                  */
2069                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2070
2071                 __disable_port(port);
2072
2073                 /* aggregator initialization */
2074                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2075
2076                 ad_initialize_agg(aggregator);
2077
2078                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2079                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2080                 aggregator->slave = slave;
2081                 aggregator->is_active = 0;
2082                 aggregator->num_of_ports = 0;
2083         }
2084 }
2085
2086 /**
2087  * bond_3ad_unbind_slave - deinitialize a slave's port
2088  * @slave: slave struct to work on
2089  *
2090  * Search for the aggregator that is related to this port, remove the
2091  * aggregator and assign another aggregator for other port related to it
2092  * (if any), and remove the port.
2093  */
2094 void bond_3ad_unbind_slave(struct slave *slave)
2095 {
2096         struct port *port, *prev_port, *temp_port;
2097         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2098         int select_new_active_agg = 0;
2099         struct bonding *bond = slave->bond;
2100         struct slave *slave_iter;
2101         struct list_head *iter;
2102         bool dummy_slave_update; /* Ignore this value as caller updates array */
2103
2104         /* Sync against bond_3ad_state_machine_handler() */
2105         spin_lock_bh(&bond->mode_lock);
2106         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2107         port = &(SLAVE_AD_INFO(slave)->port);
2108
2109         /* if slave is null, the whole port is not initialized */
2110         if (!port->slave) {
2111                 slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n");
2112                 goto out;
2113         }
2114
2115         slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n",
2116                   aggregator->aggregator_identifier);
2117
2118         /* Tell the partner that this port is not suitable for aggregation */
2119         port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
2120         port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
2121         port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
2122         port->actor_oper_port_state &= ~LACP_STATE_AGGREGATION;
2123         __update_lacpdu_from_port(port);
2124         ad_lacpdu_send(port);
2125
2126         /* check if this aggregator is occupied */
2127         if (aggregator->lag_ports) {
2128                 /* check if there are other ports related to this aggregator
2129                  * except the port related to this slave(thats ensure us that
2130                  * there is a reason to search for new aggregator, and that we
2131                  * will find one
2132                  */
2133                 if ((aggregator->lag_ports != port) ||
2134                     (aggregator->lag_ports->next_port_in_aggregator)) {
2135                         /* find new aggregator for the related port(s) */
2136                         bond_for_each_slave(bond, slave_iter, iter) {
2137                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2138                                 /* if the new aggregator is empty, or it is
2139                                  * connected to our port only
2140                                  */
2141                                 if (!new_aggregator->lag_ports ||
2142                                     ((new_aggregator->lag_ports == port) &&
2143                                      !new_aggregator->lag_ports->next_port_in_aggregator))
2144                                         break;
2145                         }
2146                         if (!slave_iter)
2147                                 new_aggregator = NULL;
2148
2149                         /* if new aggregator found, copy the aggregator's
2150                          * parameters and connect the related lag_ports to the
2151                          * new aggregator
2152                          */
2153                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2154                                 slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2155                                           aggregator->aggregator_identifier,
2156                                           new_aggregator->aggregator_identifier);
2157
2158                                 if ((new_aggregator->lag_ports == port) &&
2159                                     new_aggregator->is_active) {
2160                                         slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2161                                         select_new_active_agg = 1;
2162                                 }
2163
2164                                 new_aggregator->is_individual = aggregator->is_individual;
2165                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2166                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2167                                 new_aggregator->partner_system = aggregator->partner_system;
2168                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2169                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2170                                 new_aggregator->receive_state = aggregator->receive_state;
2171                                 new_aggregator->transmit_state = aggregator->transmit_state;
2172                                 new_aggregator->lag_ports = aggregator->lag_ports;
2173                                 new_aggregator->is_active = aggregator->is_active;
2174                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2175
2176                                 /* update the information that is written on
2177                                  * the ports about the aggregator
2178                                  */
2179                                 for (temp_port = aggregator->lag_ports; temp_port;
2180                                      temp_port = temp_port->next_port_in_aggregator) {
2181                                         temp_port->aggregator = new_aggregator;
2182                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2183                                 }
2184
2185                                 ad_clear_agg(aggregator);
2186
2187                                 if (select_new_active_agg)
2188                                         ad_agg_selection_logic(__get_first_agg(port),
2189                                                                &dummy_slave_update);
2190                         } else {
2191                                 slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2192                         }
2193                 } else {
2194                         /* in case that the only port related to this
2195                          * aggregator is the one we want to remove
2196                          */
2197                         select_new_active_agg = aggregator->is_active;
2198                         ad_clear_agg(aggregator);
2199                         if (select_new_active_agg) {
2200                                 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2201                                 /* select new active aggregator */
2202                                 temp_aggregator = __get_first_agg(port);
2203                                 if (temp_aggregator)
2204                                         ad_agg_selection_logic(temp_aggregator,
2205                                                                &dummy_slave_update);
2206                         }
2207                 }
2208         }
2209
2210         slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number);
2211
2212         /* find the aggregator that this port is connected to */
2213         bond_for_each_slave(bond, slave_iter, iter) {
2214                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2215                 prev_port = NULL;
2216                 /* search the port in the aggregator's related ports */
2217                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2218                      prev_port = temp_port,
2219                      temp_port = temp_port->next_port_in_aggregator) {
2220                         if (temp_port == port) {
2221                                 /* the aggregator found - detach the port from
2222                                  * this aggregator
2223                                  */
2224                                 if (prev_port)
2225                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2226                                 else
2227                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2228                                 temp_aggregator->num_of_ports--;
2229                                 if (__agg_active_ports(temp_aggregator) == 0) {
2230                                         select_new_active_agg = temp_aggregator->is_active;
2231                                         ad_clear_agg(temp_aggregator);
2232                                         if (select_new_active_agg) {
2233                                                 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2234                                                 /* select new active aggregator */
2235                                                 ad_agg_selection_logic(__get_first_agg(port),
2236                                                                        &dummy_slave_update);
2237                                         }
2238                                 }
2239                                 break;
2240                         }
2241                 }
2242         }
2243         port->slave = NULL;
2244
2245 out:
2246         spin_unlock_bh(&bond->mode_lock);
2247 }
2248
2249 /**
2250  * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2251  * @bond: bonding struct to work on
2252  *
2253  * If an ad_actor setting gets changed we need to update the individual port
2254  * settings so the bond device will use the new values when it gets upped.
2255  */
2256 void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2257 {
2258         struct list_head *iter;
2259         struct slave *slave;
2260
2261         ASSERT_RTNL();
2262
2263         BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2264         if (is_zero_ether_addr(bond->params.ad_actor_system))
2265                 BOND_AD_INFO(bond).system.sys_mac_addr =
2266                     *((struct mac_addr *)bond->dev->dev_addr);
2267         else
2268                 BOND_AD_INFO(bond).system.sys_mac_addr =
2269                     *((struct mac_addr *)bond->params.ad_actor_system);
2270
2271         spin_lock_bh(&bond->mode_lock);
2272         bond_for_each_slave(bond, slave, iter) {
2273                 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2274
2275                 __ad_actor_update_port(port);
2276                 port->ntt = true;
2277         }
2278         spin_unlock_bh(&bond->mode_lock);
2279 }
2280
2281 /**
2282  * bond_agg_timer_advance - advance agg_select_timer
2283  * @bond:  bonding structure
2284  *
2285  * Return true when agg_select_timer reaches 0.
2286  */
2287 static bool bond_agg_timer_advance(struct bonding *bond)
2288 {
2289         int val, nval;
2290
2291         while (1) {
2292                 val = atomic_read(&BOND_AD_INFO(bond).agg_select_timer);
2293                 if (!val)
2294                         return false;
2295                 nval = val - 1;
2296                 if (atomic_cmpxchg(&BOND_AD_INFO(bond).agg_select_timer,
2297                                    val, nval) == val)
2298                         break;
2299         }
2300         return nval == 0;
2301 }
2302
2303 /**
2304  * bond_3ad_state_machine_handler - handle state machines timeout
2305  * @work: work context to fetch bonding struct to work on from
2306  *
2307  * The state machine handling concept in this module is to check every tick
2308  * which state machine should operate any function. The execution order is
2309  * round robin, so when we have an interaction between state machines, the
2310  * reply of one to each other might be delayed until next tick.
2311  *
2312  * This function also complete the initialization when the agg_select_timer
2313  * times out, and it selects an aggregator for the ports that are yet not
2314  * related to any aggregator, and selects the active aggregator for a bond.
2315  */
2316 void bond_3ad_state_machine_handler(struct work_struct *work)
2317 {
2318         struct bonding *bond = container_of(work, struct bonding,
2319                                             ad_work.work);
2320         struct aggregator *aggregator;
2321         struct list_head *iter;
2322         struct slave *slave;
2323         struct port *port;
2324         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2325         bool update_slave_arr = false;
2326
2327         /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2328          * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2329          * concurrently due to incoming LACPDU as well.
2330          */
2331         spin_lock_bh(&bond->mode_lock);
2332         rcu_read_lock();
2333
2334         /* check if there are any slaves */
2335         if (!bond_has_slaves(bond))
2336                 goto re_arm;
2337
2338         if (bond_agg_timer_advance(bond)) {
2339                 slave = bond_first_slave_rcu(bond);
2340                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2341
2342                 /* select the active aggregator for the bond */
2343                 if (port) {
2344                         if (!port->slave) {
2345                                 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2346                                                      bond->dev->name);
2347                                 goto re_arm;
2348                         }
2349
2350                         aggregator = __get_first_agg(port);
2351                         ad_agg_selection_logic(aggregator, &update_slave_arr);
2352                 }
2353                 bond_3ad_set_carrier(bond);
2354         }
2355
2356         /* for each port run the state machines */
2357         bond_for_each_slave_rcu(bond, slave, iter) {
2358                 port = &(SLAVE_AD_INFO(slave)->port);
2359                 if (!port->slave) {
2360                         net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2361                                             bond->dev->name);
2362                         goto re_arm;
2363                 }
2364
2365                 ad_rx_machine(NULL, port);
2366                 ad_periodic_machine(port, &bond->params);
2367                 ad_port_selection_logic(port, &update_slave_arr);
2368                 ad_mux_machine(port, &update_slave_arr);
2369                 ad_tx_machine(port);
2370                 ad_churn_machine(port);
2371
2372                 /* turn off the BEGIN bit, since we already handled it */
2373                 if (port->sm_vars & AD_PORT_BEGIN)
2374                         port->sm_vars &= ~AD_PORT_BEGIN;
2375         }
2376
2377 re_arm:
2378         bond_for_each_slave_rcu(bond, slave, iter) {
2379                 if (slave->should_notify) {
2380                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2381                         break;
2382                 }
2383         }
2384         rcu_read_unlock();
2385         spin_unlock_bh(&bond->mode_lock);
2386
2387         if (update_slave_arr)
2388                 bond_slave_arr_work_rearm(bond, 0);
2389
2390         if (should_notify_rtnl && rtnl_trylock()) {
2391                 bond_slave_state_notify(bond);
2392                 rtnl_unlock();
2393         }
2394         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2395 }
2396
2397 /**
2398  * bond_3ad_rx_indication - handle a received frame
2399  * @lacpdu: received lacpdu
2400  * @slave: slave struct to work on
2401  *
2402  * It is assumed that frames that were sent on this NIC don't returned as new
2403  * received frames (loopback). Since only the payload is given to this
2404  * function, it check for loopback.
2405  */
2406 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave)
2407 {
2408         struct bonding *bond = slave->bond;
2409         int ret = RX_HANDLER_ANOTHER;
2410         struct bond_marker *marker;
2411         struct port *port;
2412         atomic64_t *stat;
2413
2414         port = &(SLAVE_AD_INFO(slave)->port);
2415         if (!port->slave) {
2416                 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2417                                      slave->dev->name, slave->bond->dev->name);
2418                 return ret;
2419         }
2420
2421         switch (lacpdu->subtype) {
2422         case AD_TYPE_LACPDU:
2423                 ret = RX_HANDLER_CONSUMED;
2424                 slave_dbg(slave->bond->dev, slave->dev,
2425                           "Received LACPDU on port %d\n",
2426                           port->actor_port_number);
2427                 /* Protect against concurrent state machines */
2428                 spin_lock(&slave->bond->mode_lock);
2429                 ad_rx_machine(lacpdu, port);
2430                 spin_unlock(&slave->bond->mode_lock);
2431                 break;
2432         case AD_TYPE_MARKER:
2433                 ret = RX_HANDLER_CONSUMED;
2434                 /* No need to convert fields to Little Endian since we
2435                  * don't use the marker's fields.
2436                  */
2437                 marker = (struct bond_marker *)lacpdu;
2438                 switch (marker->tlv_type) {
2439                 case AD_MARKER_INFORMATION_SUBTYPE:
2440                         slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n",
2441                                   port->actor_port_number);
2442                         ad_marker_info_received(marker, port);
2443                         break;
2444                 case AD_MARKER_RESPONSE_SUBTYPE:
2445                         slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n",
2446                                   port->actor_port_number);
2447                         ad_marker_response_received(marker, port);
2448                         break;
2449                 default:
2450                         slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n",
2451                                   port->actor_port_number);
2452                         stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx;
2453                         atomic64_inc(stat);
2454                         stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx;
2455                         atomic64_inc(stat);
2456                 }
2457                 break;
2458         default:
2459                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx);
2460                 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx);
2461         }
2462
2463         return ret;
2464 }
2465
2466 /**
2467  * ad_update_actor_keys - Update the oper / admin keys for a port based on
2468  * its current speed and duplex settings.
2469  *
2470  * @port: the port we'are looking at
2471  * @reset: Boolean to just reset the speed and the duplex part of the key
2472  *
2473  * The logic to change the oper / admin keys is:
2474  * (a) A full duplex port can participate in LACP with partner.
2475  * (b) When the speed is changed, LACP need to be reinitiated.
2476  */
2477 static void ad_update_actor_keys(struct port *port, bool reset)
2478 {
2479         u8 duplex = 0;
2480         u16 ospeed = 0, speed = 0;
2481         u16 old_oper_key = port->actor_oper_port_key;
2482
2483         port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2484         if (!reset) {
2485                 speed = __get_link_speed(port);
2486                 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2487                 duplex = __get_duplex(port);
2488                 port->actor_admin_port_key |= (speed << 1) | duplex;
2489         }
2490         port->actor_oper_port_key = port->actor_admin_port_key;
2491
2492         if (old_oper_key != port->actor_oper_port_key) {
2493                 /* Only 'duplex' port participates in LACP */
2494                 if (duplex)
2495                         port->sm_vars |= AD_PORT_LACP_ENABLED;
2496                 else
2497                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2498
2499                 if (!reset) {
2500                         if (!speed) {
2501                                 slave_err(port->slave->bond->dev,
2502                                           port->slave->dev,
2503                                           "speed changed to 0 on port %d\n",
2504                                           port->actor_port_number);
2505                         } else if (duplex && ospeed != speed) {
2506                                 /* Speed change restarts LACP state-machine */
2507                                 port->sm_vars |= AD_PORT_BEGIN;
2508                         }
2509                 }
2510         }
2511 }
2512
2513 /**
2514  * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2515  * change indication
2516  *
2517  * @slave: slave struct to work on
2518  *
2519  * Handle reselection of aggregator (if needed) for this port.
2520  */
2521 void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2522 {
2523         struct port *port;
2524
2525         port = &(SLAVE_AD_INFO(slave)->port);
2526
2527         /* if slave is null, the whole port is not initialized */
2528         if (!port->slave) {
2529                 slave_warn(slave->bond->dev, slave->dev,
2530                            "speed/duplex changed for uninitialized port\n");
2531                 return;
2532         }
2533
2534         spin_lock_bh(&slave->bond->mode_lock);
2535         ad_update_actor_keys(port, false);
2536         spin_unlock_bh(&slave->bond->mode_lock);
2537         slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n",
2538                   port->actor_port_number);
2539 }
2540
2541 /**
2542  * bond_3ad_handle_link_change - handle a slave's link status change indication
2543  * @slave: slave struct to work on
2544  * @link: whether the link is now up or down
2545  *
2546  * Handle reselection of aggregator (if needed) for this port.
2547  */
2548 void bond_3ad_handle_link_change(struct slave *slave, char link)
2549 {
2550         struct aggregator *agg;
2551         struct port *port;
2552         bool dummy;
2553
2554         port = &(SLAVE_AD_INFO(slave)->port);
2555
2556         /* if slave is null, the whole port is not initialized */
2557         if (!port->slave) {
2558                 slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n");
2559                 return;
2560         }
2561
2562         spin_lock_bh(&slave->bond->mode_lock);
2563         /* on link down we are zeroing duplex and speed since
2564          * some of the adaptors(ce1000.lan) report full duplex/speed
2565          * instead of N/A(duplex) / 0(speed).
2566          *
2567          * on link up we are forcing recheck on the duplex and speed since
2568          * some of he adaptors(ce1000.lan) report.
2569          */
2570         if (link == BOND_LINK_UP) {
2571                 port->is_enabled = true;
2572                 ad_update_actor_keys(port, false);
2573         } else {
2574                 /* link has failed */
2575                 port->is_enabled = false;
2576                 ad_update_actor_keys(port, true);
2577         }
2578         agg = __get_first_agg(port);
2579         ad_agg_selection_logic(agg, &dummy);
2580
2581         spin_unlock_bh(&slave->bond->mode_lock);
2582
2583         slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n",
2584                   port->actor_port_number,
2585                   link == BOND_LINK_UP ? "UP" : "DOWN");
2586
2587         /* RTNL is held and mode_lock is released so it's safe
2588          * to update slave_array here.
2589          */
2590         bond_update_slave_arr(slave->bond, NULL);
2591 }
2592
2593 /**
2594  * bond_3ad_set_carrier - set link state for bonding master
2595  * @bond: bonding structure
2596  *
2597  * if we have an active aggregator, we're up, if not, we're down.
2598  * Presumes that we cannot have an active aggregator if there are
2599  * no slaves with link up.
2600  *
2601  * This behavior complies with IEEE 802.3 section 43.3.9.
2602  *
2603  * Called by bond_set_carrier(). Return zero if carrier state does not
2604  * change, nonzero if it does.
2605  */
2606 int bond_3ad_set_carrier(struct bonding *bond)
2607 {
2608         struct aggregator *active;
2609         struct slave *first_slave;
2610         int ret = 1;
2611
2612         rcu_read_lock();
2613         first_slave = bond_first_slave_rcu(bond);
2614         if (!first_slave) {
2615                 ret = 0;
2616                 goto out;
2617         }
2618         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2619         if (active) {
2620                 /* are enough slaves available to consider link up? */
2621                 if (__agg_active_ports(active) < bond->params.min_links) {
2622                         if (netif_carrier_ok(bond->dev)) {
2623                                 netif_carrier_off(bond->dev);
2624                                 goto out;
2625                         }
2626                 } else if (!netif_carrier_ok(bond->dev)) {
2627                         netif_carrier_on(bond->dev);
2628                         goto out;
2629                 }
2630         } else if (netif_carrier_ok(bond->dev)) {
2631                 netif_carrier_off(bond->dev);
2632         }
2633 out:
2634         rcu_read_unlock();
2635         return ret;
2636 }
2637
2638 /**
2639  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2640  * @bond: bonding struct to work on
2641  * @ad_info: ad_info struct to fill with the bond's info
2642  *
2643  * Returns:   0 on success
2644  *          < 0 on error
2645  */
2646 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2647                                    struct ad_info *ad_info)
2648 {
2649         struct aggregator *aggregator = NULL;
2650         struct list_head *iter;
2651         struct slave *slave;
2652         struct port *port;
2653
2654         bond_for_each_slave_rcu(bond, slave, iter) {
2655                 port = &(SLAVE_AD_INFO(slave)->port);
2656                 if (port->aggregator && port->aggregator->is_active) {
2657                         aggregator = port->aggregator;
2658                         break;
2659                 }
2660         }
2661
2662         if (!aggregator)
2663                 return -1;
2664
2665         ad_info->aggregator_id = aggregator->aggregator_identifier;
2666         ad_info->ports = __agg_active_ports(aggregator);
2667         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2668         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2669         ether_addr_copy(ad_info->partner_system,
2670                         aggregator->partner_system.mac_addr_value);
2671         return 0;
2672 }
2673
2674 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2675 {
2676         int ret;
2677
2678         rcu_read_lock();
2679         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2680         rcu_read_unlock();
2681
2682         return ret;
2683 }
2684
2685 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2686                          struct slave *slave)
2687 {
2688         struct lacpdu *lacpdu, _lacpdu;
2689
2690         if (skb->protocol != PKT_TYPE_LACPDU)
2691                 return RX_HANDLER_ANOTHER;
2692
2693         if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2694                 return RX_HANDLER_ANOTHER;
2695
2696         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2697         if (!lacpdu) {
2698                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx);
2699                 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx);
2700                 return RX_HANDLER_ANOTHER;
2701         }
2702
2703         return bond_3ad_rx_indication(lacpdu, slave);
2704 }
2705
2706 /**
2707  * bond_3ad_update_lacp_rate - change the lacp rate
2708  * @bond: bonding struct
2709  *
2710  * When modify lacp_rate parameter via sysfs,
2711  * update actor_oper_port_state of each port.
2712  *
2713  * Hold bond->mode_lock,
2714  * so we can modify port->actor_oper_port_state,
2715  * no matter bond is up or down.
2716  */
2717 void bond_3ad_update_lacp_rate(struct bonding *bond)
2718 {
2719         struct port *port = NULL;
2720         struct list_head *iter;
2721         struct slave *slave;
2722         int lacp_fast;
2723
2724         lacp_fast = bond->params.lacp_fast;
2725         spin_lock_bh(&bond->mode_lock);
2726         bond_for_each_slave(bond, slave, iter) {
2727                 port = &(SLAVE_AD_INFO(slave)->port);
2728                 if (lacp_fast)
2729                         port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
2730                 else
2731                         port->actor_oper_port_state &= ~LACP_STATE_LACP_TIMEOUT;
2732         }
2733         spin_unlock_bh(&bond->mode_lock);
2734 }
2735
2736 size_t bond_3ad_stats_size(void)
2737 {
2738         return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */
2739                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */
2740                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */
2741                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */
2742                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */
2743                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */
2744                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */
2745                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */
2746                nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */
2747 }
2748
2749 int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats)
2750 {
2751         u64 val;
2752
2753         val = atomic64_read(&stats->lacpdu_rx);
2754         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val,
2755                               BOND_3AD_STAT_PAD))
2756                 return -EMSGSIZE;
2757         val = atomic64_read(&stats->lacpdu_tx);
2758         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val,
2759                               BOND_3AD_STAT_PAD))
2760                 return -EMSGSIZE;
2761         val = atomic64_read(&stats->lacpdu_unknown_rx);
2762         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val,
2763                               BOND_3AD_STAT_PAD))
2764                 return -EMSGSIZE;
2765         val = atomic64_read(&stats->lacpdu_illegal_rx);
2766         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val,
2767                               BOND_3AD_STAT_PAD))
2768                 return -EMSGSIZE;
2769
2770         val = atomic64_read(&stats->marker_rx);
2771         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val,
2772                               BOND_3AD_STAT_PAD))
2773                 return -EMSGSIZE;
2774         val = atomic64_read(&stats->marker_tx);
2775         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val,
2776                               BOND_3AD_STAT_PAD))
2777                 return -EMSGSIZE;
2778         val = atomic64_read(&stats->marker_resp_rx);
2779         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val,
2780                               BOND_3AD_STAT_PAD))
2781                 return -EMSGSIZE;
2782         val = atomic64_read(&stats->marker_resp_tx);
2783         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val,
2784                               BOND_3AD_STAT_PAD))
2785                 return -EMSGSIZE;
2786         val = atomic64_read(&stats->marker_unknown_rx);
2787         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val,
2788                               BOND_3AD_STAT_PAD))
2789                 return -EMSGSIZE;
2790
2791         return 0;
2792 }